2
What is the weight of an object of mass 8.5 kg?

83.3 (kg*m)/s^2

Explanation:weight is the combination of the mass of an object and the gravitational force on it.

Weight=mass (kg) * gravity

Gravity=9.8 m/s^2

Weight= (8.5 kg)*(9.8 m/s^2)

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.